v3.26.1
Financial Instruments Risk - Credit Risk Narrative (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2026
CAD ($)
customer
Mar. 31, 2025
CAD ($)
Disclosure of detailed information about borrowings [line items]    
Insurance coverage for company management $ 45.1 $ 43.9
Interest income on subleases $ 0.4 0.4
Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Payment terms 30 days  
Top of range    
Disclosure of detailed information about borrowings [line items]    
Payment terms 60 days  
Credit risk    
Disclosure of detailed information about borrowings [line items]    
Accounts receivables from non-government wholesale customers $ 36.2 26.2
Number of customers with significant increase in credit risk | customer 1  
Expense recognized for credit losses $ 1.6 0.1
Credit risk | Provision for credit losses | Trade receivables    
Disclosure of detailed information about borrowings [line items]    
Financial assets 2.4 0.8
Gain on recovery of loans and advances previously written off $ 0.1  
Write-off   $ 0.1
Credit risk | Trade receivables | Two Customers    
Disclosure of detailed information about borrowings [line items]    
Concentration percentage (or more) 10.00%  
Credit risk | Trade receivables | One Customer    
Disclosure of detailed information about borrowings [line items]    
Concentration percentage (or more)   10.00%